curl --request POST \
  --url https://api.eflow.team/v1/networks/reporting/onholdconversions \
  --header 'Content-Type: application/json' \
  --header 'X-Eflow-Api-Key: <api-key>' \
  --data '
{
  "from": "<string>",
  "to": "<string>",
  "timezone_id": 123,
  "query": {}
}
'

{
  "conversions": [
    {}
  ]
}